Casting an arraylist of integers to a string array

[Earl]

I'm trying to do a cast and I'm not sure where I'm going wrong here. I load
up the ColorExtIntID column (int) into a list array (no problem there). For
binding to a 3rd party component, it has to then be cast to a string array.

private void PopulateColors()
{

DataView dvColors = new DataView(dtColors);

ArrayList ColorIDList = new ArrayList(dvColors.Count);

Int32 i;

for (i = 0; i <= dvColors.Count - 1; i++)

{

ColorIDList.Add(dvColors["ColorExtIntID"]);

}

Int32 x = fpSpread1.ActiveSheet.ActiveRow.Index;

// this is the invalid cast where I get an exception

string[] sColorIDList = (string[])ColorIDList.ToArray(typeof(Int32));

.....

}

 

[allfyre]

try changing the last line to:

string[] sColorIDList = (string[])ColorIDList.ToArray(typeof(string));

 

[Jon Skeet [C# MVP]]

I'm trying to do a cast and I'm not sure where I'm going wrong here. I load
up the ColorExtIntID column (int) into a list array (no problem there). For
binding to a 3rd party component, it has to then be cast to a string array.

It can't. A cast doesn't change the contents, it just provides the
compiler with more information about what is present.

You'll need to create a new string array of the same size, then convert
each int to a string.